Very good explanation of the concepts of locks, and how important data-structures example HashMap are optimized to improve performance
Examples and projects are somewhat "sandbox" grade, without touching real problems of this field. Code and tests quality is poor in my opinion.
I would consider it as a overview of possible approaches, not a course. Assigments could be frustating because outcome is sometimes non-deterministic (I wasted few hours of my time because of this, it turned out that my solution was fine). Sometimes given examples are not following Java documentation in details. They could not work in corner cases. It should not be the case in the course made by professionals.
Compared to the other courses I took authors of this one did not put much effort in preparing good materials and exercises. Course can by challenging by means of standing frustration assigments could give you. And in my opinion not because it is hard to pass them and they are demanding. It is because they are not properly prepared.
I have mixed feeling about specializations. This topic can be hard. And course mentions most of the important topics in non-sequential computer computing essential to making working systems. But it does not give deep insight in many of them.
